'Not Science Fiction': Navy to Test Futuristic Gun at Sea in 2016[ Mon, 07 Apr 2014 23:22:10 GMT ]The U.S. Navy is planning sea trials for a weapon that can fire a low-cost, 23-pound (10-kg) projectile at seven times the speed of sound using electromagnetic energy, a "Star Wars" technology that will make enemies think twice, the Navy's research chief said.Rear Adm.